<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>输入圆半径</title>
</head>
<body bgcolor="pink">
    <form action="/circle" method="get" name="form">
        <table width="40%" cellspacing="0" cellpadding="2" align="CENTER">
            <tr bgcolor="#00bfff">
                <td colspan="2" align="center">填写计算圆面积所需信息</td>
            </tr>
            <tr bgcolor="orange">
                <td>半径:</td>
                <td>
                    <input type="text" value="" name="r"></td>
            </tr>
            <tr bgcolor="#00bfff">
                <td colspan="2" align="left">
                    <input type="submit" value="提交" name="submit">
                    <input type="reset" value="重置">
                </td>
            </tr>
        </table>
    </form>
</body>
</html>